Related Experiment Video
Updated: Apr 28, 2026
05:51
Production of Germ-Free Fast-Growing Broilers from a Commercial Line for Microbiota Studies
Published on: June 18, 2020
4.4K
Host Factors Potentially Contributing to Increased Susceptibility in Certain Layer Chicken Lines
Yiqun Chen1, Junlong Xiong2, Yicheng Wang1
1College of Animal Science, Xichang University, Xichang 615000, China.
Current Issues in Molecular Biology
|April 27, 2026
Summary
Commercial layers show higher avian influenza (AI) susceptibility than broilers due to immune and replication differences. Understanding host factors can guide tailored AI control strategies for poultry.
Area of Science:
- Veterinary Virology
- Immunology
- Poultry Science
Background:
- Avian influenza (AI) poses a significant threat to global poultry production.
- Commercial layer chickens may be more susceptible to AI than broiler chickens under certain conditions.
Purpose of the Study:
- To review experimental AI infection studies focusing on H9N2, H5N1, H5N2, H7N7, and H7N9 viruses.
- To evaluate host determinants influencing differential susceptibility in poultry.
- To inform breed-specific AI management strategies.
Main Methods:
- Comprehensive PubMed search of published experimental AI infection studies.
- Narrative review synthesizing data on viral replication and immune responses.
- Critical evaluation of host factors like microRNAs, MHC, sialic acid receptors, microbiota, and hormones.
Main Results:
- Consistent disparities in immune regulation and viral replication dynamics reported between layer and broiler lines.
- Host determinants including genetic (MHC), molecular (microRNAs, receptors), microbial (microbiota), and endocrine factors contribute to varied AI susceptibility.
- Findings integrated across different AI virus subtypes and pathogenicity levels.
Conclusions:
- Differential susceptibility of poultry breeds to avian influenza is influenced by a complex interplay of host factors.
- Understanding these host determinants is crucial for developing effective, breed-tailored vaccination, nutritional, and therapeutic strategies against AI.
- This review provides a foundation for targeted AI control in commercial poultry populations.
More Related Videos
Related Concept Videos
01:26Factors Affecting the Risk of Infection
14.1K
The hosts' susceptibility to infection depends on several factors. The integrity of the skin and mucous membranes helps protect the body against microbial attacks. When the skin is altered, the chance of infection, limb loss, and even death increases.
The integrity and count of the white blood cells help the body resist pathogens and fight infection. When impaired, it reduces the body's resistance to pathogens. The acidic pH levels of the gastrointestinal, genitourinary tracts, and skin...
The integrity and count of the white blood cells help the body resist pathogens and fight infection. When impaired, it reduces the body's resistance to pathogens. The acidic pH levels of the gastrointestinal, genitourinary tracts, and skin...
14.1K
02:27Background and Environment Affect Phenotype
5.8K
Although the genetic makeup of an organism plays a major role in determining the phenotype, there are also several environmental factors, such as temperature, oxygen availability, presence of mutagens, that can alter an organism’s phenotype.
An example of how genetic background affects phenotype can be seen in horses. The Extension gene in horses is responsible for their coat color. A wild-type gene (EE) produces black pigment in the coat, while a mutant gene (ee) produces red pigment. A...
An example of how genetic background affects phenotype can be seen in horses. The Extension gene in horses is responsible for their coat color. A wild-type gene (EE) produces black pigment in the coat, while a mutant gene (ee) produces red pigment. A...
5.8K
00:49Complementation Tests
4.9K
A complementation test is a simple cross to identify whether the two mutations are located on the same gene or different genes. It was first performed by Edward Lewis in the 1940s while working on fruit flies. He developed the test to identify the location and arrangement of different mutations on chromosomes.
Organisms heterozygous for different mutations are crossed pairwise in all combinations. If present on different genes, the mutations can complement each other by providing the missing...
Organisms heterozygous for different mutations are crossed pairwise in all combinations. If present on different genes, the mutations can complement each other by providing the missing...
4.9K
01:25Clinical Significance of Antibiotic Resistance
85
Methicillin-resistant Staphylococcus aureus (MRSA) presents a critical public health threat, arising from its capacity to resist β-lactam antibiotics due to acquisition of the mecA gene within the staphylococcal cassette chromosome mec (SCCmec). This gene encodes penicillin-binding protein 2a (PBP2a), which impairs binding efficacy of methicillin and other β-lactams. MRSA has evolved into distinct clonal lineages impacting humans and animals alike, reinforcing its significance within...
85
01:28Regulation of Bacterial Virulence
70
Pathogenic bacteria employ a range of regulatory mechanisms to modulate the expression of virulence genes in response to environmental and host-derived signals. These mechanisms ensure that virulence factors are expressed only under favorable conditions, thereby optimizing infection and survival strategies.Mechanisms of Virulence RegulationKey regulatory strategies include:Two-Component Systems: These consist of a membrane-bound sensor kinase and a cytoplasmic response regulator. Environmental...
70